power tap vs rectifier

power tap

noun
  • A multi-socket plug that can be used to channel electricity from a single socket. 

rectifier

noun
  • A device that converts alternating current into direct current; often a diode. 

  • The activation function f(x)= max (0,x), where x is the input to a neuron. 

  • An instrument used for determining and rectifying the variations of the compass on board ship. 

  • Something that rectifies. 

How often have the words power tap and rectifier occurred in a corpus of books? (source: Google Ngram Viewer )